The cost of fuel of a running bus is directly propotionate to the square of the speed of the bus. It adds to an additional fixed cost of rs. 108/ hr.
the cost of fuel is 48/ hr when the bus moves at an speed of 20 km/hr.
what is its most economical speed?

NOTE : Please dont give me references......I need this particular sum solved ... 

Dear Student,
Please find below the solution to the asked query:

Let cost of fuel be   P/ hour and speed of vehicle be v km/hourAccording to questionP=kv2When v=20, P=4848=k202k=48400=325P=325v2There is something missing in the question. How much distance bus need to cover should mention. OtherwiseP= 108 /hour108=325v2v2=108×253=36×25v=6×5=30 km/hour

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